Wire-drawing machine



W."D. PIERSON.

WIRE DRAWING MACHINE.

APPLICATION FILED mac. 1, 1919.

Patented Aug. 9, 1921.

2 SHEETS-SHEET I.

' Z7206 for Patented Aug. 9, 1921.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

ASSIGNOR TO THE WATER- WIRE-DMWING MACHINE.

Specification of Letters Patent.

Patented Aug. 9, 1921.

Application filed December 1, 1919. Serial No. 841,686.

To all whom it may concern Be it known that I, WILLIAM D. PIERSON,

a citizen of the United States, residing at- Waterbury, in the county of New Haven and Stateof Connecticut, have invented certain new and useful Improvements in W re- Drawing Machines, of wh1ch the following is a specification, reference being had therein' to the accompanying drawmgs.

My invention relates to new and useful improvements in wire drawing machines having particular reference to means thereon for gripping the wire on the Wire block, the die holder and its mountings, and means for automatically stopping the block when the tension upon the die is released, either by reason of the fact that the w1re has been entirely drawn therethrough or by a break in the same. 0

' It is the object of my invention, among other things, to provide mechanism that will accomplish the above and other results composed of parts that w1ll be certain 1n their operations, simple in deslgn and structure, and that may be produced at the mlnimum cost and capable of appl1cat1on to types of wire drawing machinery now generally used.

To these, and other ends, my invention consists in the wire drawing machine, having certain details of construction and combinations of parts, as will be herelnafter described and more particularly pointed out in the claims.

Referrin to the drawings, in which like numerals 0 reference designate like parts in the several figures;

Figurel is a fragmentary plan view of a 1 portion of a wire drawing machine illustrating my improvements connected therewith;

Fig. 2 is a front elevation;

Fig. 3 is a transverse sectlonal view thereof;

Fig. 4 is a detail elevation of the die holder lever;

Fig. 5 is a detail plan vlew of the connection therefor;

Fig. 6 is an elevation showing a portlon of the front plate with the trip lever mechanism mounted thereon; and

Fig. 7 is a detail view of a modified form of the trip mechanism.

I have adopted for illustrating my inven- 12 and 13;

tion a'type of wire drawing machine or bench that is shown in Letters Patent, No. 1,025,421, dated May 7, 1912, in which the block and the means for operating it are therein generally disclosed. In this structure the numeral 10 designates. the table, supported upon suitable legs 11 that are connected by the front and back angle plates 14 is the main driving shaft which is rotating continuously in the journal boxes 15 connected with the legs 11; 16 is the block shaft rotatably' mounted in the cap 17 of the journal box 15 and having a beveled gear 18 thereon, the teeth of which mesh into those of a inion 19 fixed on the shaft 14. The wire b ock 20 has a make and break connection with the shaft 16, one form of connection mechanism for accomplishing this purpose being shown in the patent above referred to. Said make and break connection mechanism is operated through a collar 21 slidably mounted upon the shaft 16 and connected with the aforesaid mechanism through a pintle 22, the lever 23 pivoted to a fixed part by the pintle 24 and normally held in its up position by a spring 25. A foot treadle 26 is pivoted to a fixed part at 27 and near its outer end passes through an opening 28 in the front plate 29 and connected with the lever 23 through the turnbuckle connection 30. The outer end of the foot treadle 26 is provided with a foot pad 31 for convenience in manipulating it by foot pressure and mounted thereon is a latch 32 which cooperates with a notch 33 in the front plate 29 to hold said lever in a partially depressed position.

In Fig. 3 of the drawings the lever is shown by full lines in its up position, that is, when the make and break connection between block 20 and shaft 16 permits the shaft 16 to rotate while the block.20 may remain stationary or be rotated by manual manipulation if desired, and by dotted lines in its down position, that is the relative position occupied by it when the connection'with the block shaft 16 and block 20 is such that the latter rotates with said shaft. This latter is known as the drawing position, at which time the treadle 26 is held under the shoulder 34 by the spring 35 pulling upwardly.

A brake mechanism designated by the numeral 36 to retard the rotation of the block 20 is also operated from this treadle through or warmnua commonthe turn-buckle connection 37 having connection with the bell crank 38. A partial operation of the treadle 26, so that the latch 32 engages the notch 33, releases slightly the brake pressure upon the block mechanism sufiicient to permit the same to be manipulated manually.

The mechanism above described constitutes no part of my present invention and is only shown and described to illustrate the general construction and operationof one form of wire drawing machine to which my 1nvention may be applied, the subject matter of the details thereof being more or less set forth in my co-pending application for'Letters Patent designated by the Serial No. 282,399.

My new and improved gripping mechanism consists essentially of a gripping lever 39 mounted upon a stud 40 fixed in the cutback portion 41 of the wire block having an eccentric toothed portion 42 and a fixed anvil 43 also mounted in said cut-back portion with an exposed toothed face 44 lying at an angle to the plane of rotation of said block, th s angle being such that it is substantially the same as that occupied by the wire when it first enters said gripping mechanism.

Toothed gripping devices have heretofore been used for the purpose herein set forth, but so far as 1 am at present advised no one has used a stationary anvil having an inclined upper face that corresponds substantially with the angle of inclination of the wire when it first enters. said gripping mechanism. Pivotally mounted upon the stud 45 fixed in the angle plate 12, is the die holder lever 46 which projects upwardly through an opening 47 in the table 10, and journaled therein upon the stud 48 is the swivel block 49.

A die holder 50 is pivotally connected to the swivel block 49 by the pintle 51 and during the drawing operation normally rests flat on the top of the table 10 This dle holder is provided with the usual hook end 52 against which rests the drawing die 53 held against accidental relative movement by the hand wheel 54. When the end of the wire to be drawn first engages the gripping mechanism, the approximate line of the wire in plan view, if short, is that shown by the lines 4855 and then during the drawing of the wire the die holder shifts so that the approximate wire line is designated by the dotted line 48-56, this horizontal movement being about the center of the stud 48. The initial pull on the wire raises the die end of the die holder around the axis of the pintle 51 so that the wire line is substantially as shown in Fig. 2, designated 5157, this line, it Will be noted,being substantially parallel with the toothed face 44 of the anvil 43. When the block is actually drawing wire, the line 51-57 passes to the line 5172 asemee Movement of the die holder lever 46 is limited in opposite directions by the stop blocks 58 and 59, adjust-ably secured to the underside of the table 10 by the bolts 60-60' the same passing through slotted o enings 61 therein. The upper faces of t e stop blocks 58 and 59 and the underside of the table at this point are preferably roughened so as to prevent accidental relative movement with each other.

A spring 62 fixed at one end to the lever 46 and at the other end to a post 63 exerts its tension to move the said lever toward and against the stop block 59 and the drawing strain transmitted to the said lever 46 through the die and die holder moves said lever toward and against the stop block 58 against the tension of the spring 62.

Pivotally mounted on the stud 65 fixed in the front plate 29 is the rock lever 64 which has an operative and adjustable connection with the lever 46 through the connection mechanism, comprising the rods 67 and 68 connected by a turn buckle 66, whereby the length of said connection may be varied. Also movably mounted upon a stud 69 in said front plate 29 is a second rock lever 70, having a pivotal connection with one end of the rock lever 64 and carrying at the other end a screw 71 that moves against one side of the treadle 26 and releases it from the shoulder 34 when the levers 64 and 70 are actuated in one direction by the lever 46.

In operation, when the strain is on the wire, as a result of the drawing operation, the lever 46 is against the stop block 58 and the levers 64 and 70 are in relative positions substantially shown in Fig. 2. If the end of the wire is drawn through the dies or perchance the wire should break in two, the strain is released and the spring 62 moves the lever 46 against the stop block 59 and imparts a rocking movement to the lever 64 through the connection therebetween and this movement is transmitted to the lever 70 and the screw 71 releases the treadle 26 from the shoulder 34, and the spring 35 lifts said lever and by reason thereof disengages the connection between the shafts 16 and block 20 and at the same time applies the brake mechanism 36, which causes the block to come to a full stop.

As above described the lever 26 is arranged so asto be released from the notch 34 by a movement thereof to the left. Some operators, however, prefer to move thelever to the right. A construction of the parts to accommodate such action is shown in Fig. 7 wherein the notch 34 is on the left side of the 60 table; a'fixed plate; a treadle mechanism for opening 28 and the notch 33 is upon the right slde of said opening, these being exactly the reverse relative positions from thoseshown in Fig.- 2. With the notches so placed a single lever 73 pivoted at 74 is substituted for the levers 64 and 70. The operation of all of the other parts of the mechanism is the same in both constructions.

I have illustrated only one form of die holder but it is obvious that any other form of die holder may be used equally as well, so

. long as the same is pivotally mounted.

There are minor changes and alterations that can be made within my invention, aside from those herein suggested, and I would therefore have it understood that I do not limit myself to the exact construction herein shown and described, but claim all that falls fairly within the spirit and scope of the appended claims.

Having described my invention, what I claim as new and desire'to secure by Letters Patent, is: v a

'1. The combination with a wire block; of means for securing wire thereto, said-means comprising a pivotally mounted lever, one end of which is eccentric tov said pivot mounting and having teeth thereon; and a fixed anvil having a toothed face lying at an angle to the plane of rotation of said block.

2. The combination with a wire block; of

means for securing wire thereto, said means comprising a pivotally mounted lever, one end of which is eccentric to said pivot mounting and having teeth thereon; 'a fixed anvil having a toothed face lying at such anangle to said block as to be substantially parallel with the angle of the wire as it first enga es said mechanism.

3. he combination with a wire block; of'

' means for securing wire thereto, said means I the combination with .a table; of a die holder upon the upper surface of said table;

a level" pivotally mounted so as to move substantially parallel with the front of said initiating the starting and stopping of'said block and having engagement w th said fixed plate; means for releasing said treadle mechanism from its engagement. with said fixed plate; and a connection between the said lever and the said means for releasing said treadle mechanism whereby movement of said lever in one direction releases said treadle mechanism from its engagement with said fixed plate and stops the rotation of said block.

'6. In a mechanism of the classdescribed, the combination with a' table; of a die holder .upon the uppersurface of said table; a lever pivotally mounted so as to move substan tially parallel with the front of said table; afixed plate;-a treadle mechanism for initiating the starting and stopping of said block and having engagement with said fixed plate; a second lever pivotally'mounted and through its movement releasing said treadlemechanism from its engagement with said fixed plate; and a connection between said" levers, whereby the movement of the first of the aforesaid levers in one direction re leases said treadle mechanism from its engagement with said fixed plate and stops the rotation of said block.

7. In a mechanism of the class described; the combination witha table of a die holder upon the upper surface of said table; a lever plvotally mounted so as to move substantially parallel with the front of said table; a fixed plate; a treadle mechanism for initiating the starting and stopping of said block and having engagement wlth said fixed plate; a pivotally mounted second lever; a

third lever also pivotally mounted and having an operative connection with said second. lever and during its movement releasing said.

treadle mechanism from its engagement with the-said fixed plate; and, a connection between the first of'the aforesaid levers and 1 the second lever; whereby movement of the former in-one direction imparts movement to said treadle mechanism .and releases the same from its engagement with said fixed plate and stops the rotation of said block.

8. In a mechanism of the character described, the combination with a die block;

of lever mechanisrn' initiating the'starting and stopping of said block; a movably mounted member; a connection between said movably mounted member and said lever mechanism whereby the-movement of the ,former in-one dlrectlon releases said lever mechanism; yieldin means connected with said movable mem er and actuating the same in one direction; a die block connected with said movable member; and adjustable. stop members for limiting the movement of said movable member in both directions.

In testimony whereof I have hereunto afiixed my signature.

' WILLIAM B. PIERSON. 

